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Reinsurance (Tables)
 9 Months Ended
Sep. 30, 2017
Reinsurance Disclosures [Abstract]  
Schedule of reductions to premiums and contract charges due to reinsurance premium ceded amounts
Property-liability insurance premiums earned and life and annuity premiums and contract charges have been reduced by reinsurance ceded amounts shown in the following table.
($ in millions)
Three months ended September 30,
 
Nine months ended September 30,
 
2017
 
2016
 
2017

2016
Property-liability insurance premiums earned
$
245

 
$
244

 
$
745

 
$
741

Life and annuity premiums and contract charges
75

 
78

 
225

 
230
Schedule of reductions to costs and expenses due to reinsurance ceded amounts
Property-liability insurance claims and claims expense, life and annuity contract benefits and interest credited to contractholder funds have been reduced by the reinsurance ceded amounts shown in the following table.
($ in millions)
Three months ended September 30,
 
Nine months ended September 30,
 
2017
 
2016
 
2017
 
2016
Property-liability insurance claims and claims expense (1)
$
1,268

 
$
493

 
$
1,523

 
$
895

Life and annuity contract benefits
47

 
25

 
164

 
172
Interest credited to contractholder funds
6

 
7

 
17

 
18

_______________
(1) 
Includes expected reinsurance recoveries on catastrophe losses related to homeowners flood claims covered by the National Flood Insurance Program.